Newell and his colleagues have also used live performances [25] and have
discussed the pros. of cons. of this type of presentation [22, 29]. Although the use of actors may not be wholly appropriate for very detailed evaluations of user interface,
they describe the advantages both when a more holistic approach is required, and for
very novel design briefs where an entirely new technology is being developed. It is
worth noting that script writers and actors are trained as professional observers of
human behavior and their skill is presenting that behavior in a way which engages the
viewer/audience.